Mandriva has done quite a lot of work on optimizing boot speed for its latest release, Mandriva Linux 2009. Frederic Crozat (head of the French engineering team) has written a blog post summarizing Mandriva's past work on this front, and the tweaks and improvements made for 2009. It shows that close analysis of inefficiencies in boot, and fixing 'small' bugs, can result in gains as large or larger than 'big picture' items like new initialization systems.